129971071 has 2 divisors, whose sum is σ = 129971072. Its totient is φ = 129971070.

The previous prime is 129971057. The next prime is 129971087. The reversal of 129971071 is 170179921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129971071 - 2²¹ = 127873919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129971071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129971771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64985535 + 64985536.

It is an arithmetic number, because the mean of its divisors is an integer number (64985536).

Almost surely, 2^129971071 is an apocalyptic number.

129971071 is a deficient number, since it is larger than the sum of its proper divisors (1).

129971071 is an equidigital number, since it uses as much as digits as its factorization.

129971071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 37.

The square root of 129971071 is about 11400.4855598347. The cubic root of 129971071 is about 506.5421225989.

The spelling of 129971071 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, seventy-one".